Quad HD displays NEED the S805 or higher! The SM-G906S is what Samsung should have released to begin with! I compare the Original Galaxy S5 to the new SM-G906S and also against the LG G3 and the Oppo Find 7.
(Thank you 28mobile.com for sending the device to look at! Buy G906S at http://28mobile.com)
Galaxy S5 review:
Galaxy S5 Display review: